Shaking table is a technology that is still used in processing of tin ore using water as a medium.In the application at PT Timah Tbk,the shaking table is still used to process low grade tin ore into tin ore with a sta...Shaking table is a technology that is still used in processing of tin ore using water as a medium.In the application at PT Timah Tbk,the shaking table is still used to process low grade tin ore into tin ore with a standard smelting grade of PT Timah(72%-74%Sn).In processing tin ore using a shaking table,valuable minerals and impurity minerals are separated based on differences in specific gravity,size and shape of the mineral.To get the recovery of valuable minerals(recovery)and optimal grades,it is strongly influenced by the separation variables of tin ore minerals.These variables include riffle,slope of deck,washing water rate,stroke length,and deck movement speed.This study aims to vary the number of riffles,table slope and time in a laboratory scale to obtain optimal recovery and grade of tin ore.Tin ore samples were obtained from the washing residue of the Toboali Washing Plant tin ore.In the experiment,the numbers of riffles set were 16(R1),24(R2)and 34(R3).The table slopes were 2°(S1),3°(S2),and 4°(S3).Time variations were 15(T1),20(T2)and 25 min(T3).The relationship between the number of riffles and the grade can be determined through quadratic polynomial regression analysis with the functionŶ=-20.60+2.26X+(-0.04X2),while the relationship between the number of riffles and recovery is determined by the functionŶ=-173.33+17.376 X+(-0.315X2).Optimal levels are obtained at variations in the number of riffle 26 by 66.43%,with levels of 8.45%Sn.Optimal recovery is obtained on the variation of the number of riffle 28 with a recovery of 66.43%.展开更多
From the data of the pitting, geoelectrical prospecting, temperature measurement, salt content analysis and detection by layering frost-heaving instruments, the authors discuss firstly the structural features of sedim...From the data of the pitting, geoelectrical prospecting, temperature measurement, salt content analysis and detection by layering frost-heaving instruments, the authors discuss firstly the structural features of sediments in the active layers in this region, and proves the presence of the bowl-shaped frost table in the stone-circles area, and then analyse the regulatities of temperature distribution in the active layer, effect of salt content on electric resistivity, thaw-settlement and frost-heaving, and their control on periglacial land-form development. It suggests that the five layers should exist in the subsurface structure , namely, active layer, frost sand and gravel layer, frost volcanic rock permeated by sea water, frost volcanic rock unperme-ated by sea water, and unfrost ancient continental basement. Finally, the permafrost table and its vertical gradient are deduced.展开更多
SYNCHROTRON TECHNOLOGY AND APPLICATIONSNo.1 1 Intermediate energy light sources and the SSRF project ZHAO Zhen—Tang9 Multiple scattering approach to X-ray absorption spectroscopyM.BENFATTO,Zi—Yu WU20 Electron gun fo...SYNCHROTRON TECHNOLOGY AND APPLICATIONSNo.1 1 Intermediate energy light sources and the SSRF project ZHAO Zhen—Tang9 Multiple scattering approach to X-ray absorption spectroscopyM.BENFATTO,Zi—Yu WU20 Electron gun for SSRFSHENG Shu—Gang,LIN Guo—Qiang,GU Qiang,LI De—Ming24 A new digital beam position monitor in SSRFCHENG Wei—Xing,LIU展开更多
文摘Shaking table is a technology that is still used in processing of tin ore using water as a medium.In the application at PT Timah Tbk,the shaking table is still used to process low grade tin ore into tin ore with a standard smelting grade of PT Timah(72%-74%Sn).In processing tin ore using a shaking table,valuable minerals and impurity minerals are separated based on differences in specific gravity,size and shape of the mineral.To get the recovery of valuable minerals(recovery)and optimal grades,it is strongly influenced by the separation variables of tin ore minerals.These variables include riffle,slope of deck,washing water rate,stroke length,and deck movement speed.This study aims to vary the number of riffles,table slope and time in a laboratory scale to obtain optimal recovery and grade of tin ore.Tin ore samples were obtained from the washing residue of the Toboali Washing Plant tin ore.In the experiment,the numbers of riffles set were 16(R1),24(R2)and 34(R3).The table slopes were 2°(S1),3°(S2),and 4°(S3).Time variations were 15(T1),20(T2)and 25 min(T3).The relationship between the number of riffles and the grade can be determined through quadratic polynomial regression analysis with the functionŶ=-20.60+2.26X+(-0.04X2),while the relationship between the number of riffles and recovery is determined by the functionŶ=-173.33+17.376 X+(-0.315X2).Optimal levels are obtained at variations in the number of riffle 26 by 66.43%,with levels of 8.45%Sn.Optimal recovery is obtained on the variation of the number of riffle 28 with a recovery of 66.43%.
文摘From the data of the pitting, geoelectrical prospecting, temperature measurement, salt content analysis and detection by layering frost-heaving instruments, the authors discuss firstly the structural features of sediments in the active layers in this region, and proves the presence of the bowl-shaped frost table in the stone-circles area, and then analyse the regulatities of temperature distribution in the active layer, effect of salt content on electric resistivity, thaw-settlement and frost-heaving, and their control on periglacial land-form development. It suggests that the five layers should exist in the subsurface structure , namely, active layer, frost sand and gravel layer, frost volcanic rock permeated by sea water, frost volcanic rock unperme-ated by sea water, and unfrost ancient continental basement. Finally, the permafrost table and its vertical gradient are deduced.
文摘SYNCHROTRON TECHNOLOGY AND APPLICATIONSNo.1 1 Intermediate energy light sources and the SSRF project ZHAO Zhen—Tang9 Multiple scattering approach to X-ray absorption spectroscopyM.BENFATTO,Zi—Yu WU20 Electron gun for SSRFSHENG Shu—Gang,LIN Guo—Qiang,GU Qiang,LI De—Ming24 A new digital beam position monitor in SSRFCHENG Wei—Xing,LIU
